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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc56e017acd5623ac4a05756d90ba32f72539d064ac34b2679991e6b3a7f642' 
  AND token = 'ttl2UfvwwiKL1OXlu04xdiae4ixUEE9xA+eocKnHZtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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