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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29334534f7cc2eeb1e3b89ce8a97543c6406b9bd24f8df54d7d909410814534' 
  AND token = 'pEUYy2OXQ9k0+JMXXw1LJQFpraS+WldUkpfEqv2i/nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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