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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97862efa943e46e5ae66132dfa415f1f7bf1cc92d398ba07b1855c5a650e2f7c' 
  AND token = 'FsicaR4XgM9Rfk4IOwEC9/9STbgjz8oqhvkwC8GIGpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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