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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e042f83e98be9263b0ea537113c1c37a15768380431327ef9a3df49d9e54e2' 
  AND token = 'j3LGwi9CCEM8p6HCXAN5NdrqOBKGsQNY8KIBA2X77oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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