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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8655f9382d2cf7ecd026fdae34ae2c894030b73ab6cf32a9ed5a8f7831b984c' 
  AND token = 'bD0STt6QBxotjBbCemA6SjXBwqnLaQ+X93BCxqyeyXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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