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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a68632124dd1886af1faf83af8fee750b3ca4273ccc53749e8ee7fd0d6242efe' 
  AND token = 'WBHY2MAX4F/P1kMjES5r434hkiLKlhWZinqn/e7P3hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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