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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce1b50cecf97a4ef72d78f4597b2006c61d40a2d599c258f60bdd595971dc7f9' 
  AND token = 'E9PSN4gPkIP+I/Tw84tagIAN5Uw/5jS7LKhkEL7kowY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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