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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56d195f7c987b3f57a821c89ac52277ecf62525e5307b8f4542201984a1b007' 
  AND token = 'uJ1fu8U5r7LMmtqXEsKuOk4NyDUsRW0mHcviP6FY97I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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