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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5908e97d3deead1980d1a2e933e09b7faa204c36b2fc966bbd3eb02069f4e6b1' 
  AND token = 'Z1WsxaVisT+U4Ze359usxywNcm1BLoLAY31mV7IWo9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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