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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bc49d6da20645a7d4ff3a8ec1e8e020a1814f3107bbe06a8238f9f1363efcf0' 
  AND token = 'fg6DqJ97Dkg55htobUSHgUds/l0C/gwKTh6UXO697A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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