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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '044cc5ab8e9f20b19e684a9f48a44cc46a4c4db9d8b9c4f16ce7e6e68b01a7fb' 
  AND token = 'oMEyCQZu279HNq6l+jJmZOl2Vz8jRfElEypDBuJu+1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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