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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db64d16eae6a9f8932b63af9ee8c6103244b9df5e34cc480a7cac8a60b1866e4' 
  AND token = 'RjxZvYNMuP2vATGla+SQWhkbEZ6MVus1wHPZSowDYWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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