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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '771f713051691e5f7ebd95faeb326ddbce3c8ebb9e26fdce55cb151c82747829' 
  AND token = 'HMkjQjaXhEP9ywJtFNXRAffhYIKlPjtvH8vD4CV04tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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