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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93c784471c24dc36e2c997a500a27fbe42d44d6285e87787b0374cd37656877' 
  AND token = 'fjzC8PhWpmp+SyaBYQn5fN6coQlmN0kZLXPuDDU1qKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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