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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db65b51b429c812d08e83b44f1d0f18cda3060fc1057334e7d766a615a793aef' 
  AND token = 'xtNAc/J/tqUxFAK4WF7aGBSPa4VwIIbszxEehELSZ/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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