SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '158d4d7d1873e721c60a9d4e2fba1a6471ca07d6c68d325ff820c2951b066fc5' 
  AND token = 'TTJXpGm7c/qDpWXOyUVKM+KiveX3DdloBBYp73r0H88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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