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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a8d0e118a12dc2028087cf475e7520b59b50dbf91458632c6fea25b55de36e' 
  AND token = 'S0uSevr8XmW1WcK9XURq9yftJuZYRifQRUtnd0l1CHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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