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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5557e07d0ce86655a6f588f7830a7026301e3d6cf8691a7c21b02f4c2348cb5f' 
  AND token = 'VofwN2YChPcxlD5H4TLJf2nilePg794TltjDQsZZSt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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