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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa883e6ac588a3cca6e2ba2e8cfcc37fd591c791b30d27d0f0811811150e0287' 
  AND token = 'WxeiKtEOuBeU+TtHp4L/DvqUao0sK5yPi3/wFV/amxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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