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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaaba6b4160dd76efe55ad151681ea3aa0647bce00d78cc8fd3ca7d64de8ede2' 
  AND token = 'HQPFKWWXNprd365kXxTlOT//Ux8/+TKaCBp/4nU6o7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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