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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df10ee310a0b1cb9a7ee15a56800c6be5cb1453f84d266b77c03dc00a5afbe9c' 
  AND token = '9XlcPyrjsUOgWPgUcQ7MTQ3hwGt14hjFQTaQ+OKU9xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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