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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee5fc96a92ebaa0f454f52fceece9ec01df984d6a7e5cacbafe44917ff66fe3' 
  AND token = 'nuuf9D3WK94jLV/7O8nwejxILMMHQqr7cW2CLK7PnJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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