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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4fbd0eaf4983eb7f42832427830048d1aa9c00a3f31aeb24545af9bca0f450d' 
  AND token = 'tkqnmTIPlJ/itVoA8g2vKBrEt9fmlTYBiYyJMttZgUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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