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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '469699310a3ffcd626855301cac913d31dac4619424ec44f920236f42117c1da' 
  AND token = '/5hMJ5E0diA2+T1QhWkmSFShJXe+k2MLE3tutZflZK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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