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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a45dffa86994a447cb0cc7843f0e4a3935a804b384f2854532b368ee7bb55cf' 
  AND token = 'gSeq9ZpVPY3l/DapNw3AHaJYu7O7Uis3nAGWQt6nBs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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