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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0726800536c9eef0d7b8eb55d0e49d8f99f0806a05bb6fcc07df129556208d56' 
  AND token = 'xewFWG4wJCZ956mwCWI3OShJah/BUgkLRptrP7Vjb8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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