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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6687259833f3dc883601025e19a51bf55e236c97d37426e3033eedeb65c591' 
  AND token = 'hGjOg4BdNTHeEqpxnSTa3HVm3xGCPBX65dhnAY0tKnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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