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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa244353b57cd87d5f75bd75cdc18f7461eb799c72f0112c2ff2e8721df11d76' 
  AND token = '5FzqeeBzSLkTJMkwcjO40PqZtGD15rIrsFFGDIXfR9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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