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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35b73f981e74bd6039eedf7a341c463395fea95cd69ad79551e2ecc9e134d03d' 
  AND token = 'D1w7NqxIe8GII6osMf1UojvAxWlfENT4qmdCr1j0FnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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