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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b8555edcb3246d131f603c99103b1c8f5d878311dad789113d4e56c01a9b9e' 
  AND token = 'OgZLSz9+I82dKMK2OXpomGPs5hhoOHx4yO0sDCbPS8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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