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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c2fc6a9a13f9c4801f48ab9bdd377b89c5fe25476c243ccf3852b233583e08' 
  AND token = 'jD4ZFh3I5b2V64y4Wiz9Aw8GGIpB/hZuF43E9HZUTUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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