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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9af75f6e78f92439489d51df0d4cca88c13f738453fcf67ab80fe951e7e59a1' 
  AND token = '2NLvHCnB/L+FK6WwveWOa2r0ViGojOKXdi9VQ4eaAxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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