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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60d4aa482b150df4214c4592fbf87d1ebe6020450746f62adb5cb5741cbf514e' 
  AND token = 'JFmb8yOblyLnrEt1bAdjlJ+18+6jd6X1DZrmeXobBQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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