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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f26cc61c453bd110c84398cb60ff13f7ca87d02ffb5944b6a49c77a2da260a8' 
  AND token = 'jguNFJ2FM2vHcL80W0DDB0TkrvXyPMlDa8JEjsO7PaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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