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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c08e49a8d6799d287b7a4b7181a4df414768f541b7b5a92a483151ac79f8c6' 
  AND token = 'cZ1C/ld1aigLROdSsdF62XdOG+rQdUnG6ehbfR4+/+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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