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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '584cc33af31787833fa866590ddfe4e39c832aefbf15e4be3b9882cc125b1cbf' 
  AND token = 'Z8rjLOrZOq/o22s2BeOaJ54/v3biUXa13yoZXEaVf2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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