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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa4eb958afc97b9ca5ac524ac34a3f4583b804ed21206d6f10468dc82f86cee' 
  AND token = 'W0XcX+I45ok0wDk/5xEszlGcJSkR0aFj+rBrIolCz3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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