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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a58c08a3db10262df0a59cc58218f59666c6d0de12fad33b42493ee08fc63a05' 
  AND token = 'Ew2JK+mBWOhtByGnMKgi7eCa1oVTSnhN2MV2Nvd5QJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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