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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052bad55c432a2fafd4adf1ffb05fd7b4466f4ce323eb40e045bb1e148b0880d' 
  AND token = 'VEe3BTB+V1pjdUvaa4KLN1gNUq3otc0R6e7MHSC6s60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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