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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab2e282caf5eea88994d18f921b9d21d5129c627d3e05cfbc940aa280610275e' 
  AND token = 'T1T4Mt56bOsDvKOqAZBwSFbQ0FcVaSHnHVFB2IOQdoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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