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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b35f17f597d14c2094dea3e70fe0d2c254fe634d2ac9db41f2e5276d1753cb05' 
  AND token = '9E8PglD9a31oThXwppikQjIkoHlr30UJRRl9SDKzKxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}