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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f4eee18f2bc90b17357d48d3d8477c7477e047d2455c03d827490846218a7c' 
  AND token = 'byCu3GNB7NBLbb5N5ZtB0dH1TaqZXjWRxDR+XZ7nT5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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