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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '968af1817dac5dd5b110069c2906c7fbcfbadc513fb2e135c1bc1b878e292ec9' 
  AND token = 'DRbLatXQ+ZhL49kbXQXYsBQbKxZVhauryNike+CHA9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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