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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50aa9abf697f8e625b9b0fb1a0a1bca0ea45d788c80df35f21a2d9d33eb37fcb' 
  AND token = 'eawK9bGJE4XUG2ser4GNO7YWbUcQY9aMvUziwxety/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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