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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4857195b8dcf0542f245b357a582c47a48e81c39ff45e2ea30735034d59b344b' 
  AND token = 'lJH/TC4YfJgX1uRAb97M/Ps7bUAhySixjc37uHGkzj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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