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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c363be3fa2b2b3ebc30e0a2a0b9e76cfbe6d6cd420c19aaaa8e7f4aa5d5cab86' 
  AND token = 'RC9ldnkrRhJ8YWL8/WpihZQBN/AHTwOMmD/XsNbEXWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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