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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72e76a1840d6fd0ab2cb308c577761783a360a8b2fcfda41af446656080d1ad5' 
  AND token = 'FS+PkrFAt0RyIq9SZLT9kGqs3q7qUuL0LAQEimwfA60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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