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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8210e19bc7bb66b36870a796cd9038be4b776821c41c40547054e06185cd7d62' 
  AND token = 'mbfMCSAyGz2SMy/ASbamLIyncSv9c7X+u5XVX+3xvD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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