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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6225244d42ee639bb495910addf98792d737bfc21e1500aa430d7d85dd4133' 
  AND token = 'd1vjwj9iF6uCKaKbfXl6jnl7BMaUtWh5endiD9Q+bL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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