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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ed772662e05308644bf1b4dc4fc085eb4608a2f97bffea828e40183f9283b3' 
  AND token = 'tr3NUiqOmu3ijcPrxMQfelbNcPt+1BfUuka5IeZRw0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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