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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32830f8d011873bffb95ba01c8138acce4d2604e811ec92cac3ff45da95ddfad' 
  AND token = 'eoyF2ZM+kCq2bFr19zj1YpdJZIpvDOw7MAvd4ccF9Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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