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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '282920c661d99e87ef9e9bd13e86da132fe578272bf6b34ece771cfed3d688cb' 
  AND token = 'xDRN6oBO0lhayJF6R4E24c3eFnbPKj9E5CwCIXu4UgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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