SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '086f9caa8eaf1886a25b14c6a6f98118f74c01b55853e04d997835e4179a8967' 
  AND token = 'EBvzdGtRne0+dclZu2zXQchNWItNHE4/WRYKfogGSyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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