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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4b12016f299e832836e394cb115c738531cb08cafdae6a40d3d83037d152778' 
  AND token = 'mOGvz8X1nSZSudDINti5aV/r6vTu5+OVITIsj2Fs8/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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