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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd01b9b3a558379e716132faabd7ecd26b99ec379466dea13e528bdc0f96f0e66' 
  AND token = '3HDm3hJOo1j4HihsZMSEEEIKXnnA3Es6TxTanWMJXPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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