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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d723e255632dfc0f952e54673bb52ce7446966a031b6b8bb36e29fa54bf3dcb' 
  AND token = '/H3sC3eMQl7mPJEQUaGVkH7nwP5UQjHB+C9XW9DNOqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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